NLP AI Startup Jobs

AI research company creating safe AGI that benefits all of humanity, known for ChatGPT and GPT models.

Medical AI platform that converts patient-clinician conversations into structured clinical notes.

Enterprise voice AI platform offering Speech-to-Text, Text-to-Speech, and Voice Agent APIs for real-time and batch use, deployable in cloud or self-hosted.

AI-powered translation platform combining machine translation with human expertise for enterprise localization.

ElevenLabs is the leading AI voice technology platform, offering ultra-realistic text-to-speech, voice cloning, and audio AI tools used by content creators, enterprises, and developers worldwide. The company has grown to over $330M in annual recurring revenue and serves customers across 45+ countries including Deutsche Telekom and Revolut.

AI patent drafting platform that helps legal teams and inventors write, analyze, and prosecute patents more efficiently.

Emotion and prosody AI that powers empathic voice interfaces and multimodal understanding.

dottxt builds structured generation tooling for production LLM applications, helping developers force reliable outputs that plug into existing software systems.

222 is an AI-powered social platform that accelerates in-real-life chance encounters, helping users form, deepen, and maintain meaningful relationships through curated offline experiences. Using psychological data and machine learning, the platform matches compatible people for intimate social events at curated venues. Backed by Y Combinator, General Catalyst, and Upfront Ventures, 222 is rebuilding social connection in the age of digital isolation.

Ada is an AI-powered customer service automation company that enables enterprises to resolve customer inquiries at scale using AI agents. The platform handles billions of interactions across 50+ languages for brands like Meta, Verizon, and Square.

Aegis AI builds an agentic email security platform focused on phishing and business-email-compromise detection for enterprise inboxes.

AI claims copilot for insurers-automates intake, triage, and adjuster workflows with explainable outputs.

Alleviate Health builds conversational AI agents that accelerate patient recruitment for clinical research sites. Their AI engages patients 24/7 across SMS and Voice, having supported 500K+ patient interactions across 190+ sites.

Alloy is a data platform for robotics that helps companies process, organize, and search through the massive volumes of sensor, camera, and telemetry data their robots generate. The Sydney-based startup enables natural language search across robot data and automated issue detection, reducing data processing time by up to 90%.

Alma is an AI-powered nutrition companion app that makes healthy eating simple and personalized. Using AI voice and photo meal logging with natural language processing, it provides proactive insights beyond calorie counting to help users build sustainable eating habits.

alphaXiv is an AI research platform that helps users understand academic papers in minutes by bringing together papers, benchmarks, and implementations in one place. The platform bridges the gap between AI research and practice, enabling engineers to quickly surface relevant papers, compare methods, and interact with implementations. Since launching in 2024, alphaXiv has reached millions of users across academia and industry.

Alterego is building a near-telepathic neural interface that translates silent speech and biosignals into computing input for more intuitive human-computer interaction.

Ambience Healthcare builds AI clinical documentation infrastructure that automates note generation, coding support, and clinician workflows for health systems.

Amigo builds clinical AI agents that healthcare teams use for intake, triage, and ongoing patient engagement across primary and specialty care workflows.

Anara (formerly Unriddle) is an AI-powered research assistant that helps scientists and academics rapidly find insights across research papers, enabling faster literature reviews and scientific discovery.

Ankar AI builds an AI operating system for patent teams, supporting drafting, office-action workflows, and patent intelligence with legal-domain AI tools.

Aqua Voice is an AI-powered voice input software that lets users write at 4x typing speed with sub-50ms startup and 3.2% word error rate. Works across any app including Cursor, Gmail, Slack, and terminal.

AI clinical assistant for providers-drafts notes, summarizes charts, and suggests next steps.

Artificial Societies builds large-scale AI simulations of human societies to help organizations predict how real-world audiences think, feel, and respond to messaging, strategies, and campaigns. Each simulation deploys networks of 300 to 5,000 interconnected AI personas grounded in real-world behavioral data.

AssemblyAI develops speech AI APIs and voice models for transcription, speech understanding, and developer workflows that turn audio into structured application data.

Assort Health builds agentic AI voice agents for healthcare call centers, automating appointment management and patient phone calls with specialty-specific generative AI. The platform handles patient access workflows that previously consumed thousands of human hours, improving patient experience while reducing operational costs. With $102 million in total funding, Assort Health serves major healthcare organizations across the United States.

Async (formerly Podcastle) is an AI-powered audio and video content creation platform that helps podcasters, educators, and marketers produce professional-grade multimedia content.

August is the first AI platform built specifically for midsize law firms, enabling configurable legal AI workflows for contract review, due diligence, discovery preparation, and drafting. Founded by a team from Columbia University's ML research lab, August serves an underserved market of over 50,000 midsize law practices worldwide employing half a million lawyers.

Avoca provides AI customer service agents for home service businesses, helping HVAC, plumbing, and electrical contractors answer calls, support customers, and convert leads 24/7.

Basedash is an AI-native business intelligence platform that lets teams create dashboards and understand their data using natural language. It connects to 600+ data sources and provides shared dashboards without requiring SQL.

Basis Research Institute is a nonprofit applied AI research organization building a universal reasoning engine by establishing the mathematical principles of intelligence. The organization focuses on probabilistic programming, causal reasoning, and program synthesis to solve intractable scientific and societal problems at unprecedented scale.

Brainfish builds ambient AI support agents and product knowledge systems that help companies resolve customer issues proactively inside their software. The platform focuses on automated answers, product guidance, and lower support burden for support teams.

Brainly is an AI-powered learning and Q&A community platform helping students with homework and study questions. With offices in Poland, Spain, and the US, it serves over 350 million users worldwide and offers AI-enhanced tutoring features.

BuildForever is a software company crafting consumer products that feel personal, magical, and deeply human. Their first product, Extra, is an email platform designed to reimagine everyday digital communication. The company believes the best consumer products come from small, inspired teams who care deeply about craft and emotion rather than scale.

BuildPrompt is an AI-powered document analysis platform for the construction industry. It enables professionals to extract key information from project documents through natural language prompts, with features for custom AI workflows and model tuning.

Cartesia builds real-time voice and multimodal AI models with low-latency inference for production applications. Its platform combines foundational model research with developer APIs for voice agents, audio generation, and on-device intelligence.

Character.AI is a consumer AI chat platform where users create and interact with AI characters for entertainment, roleplay, and conversational experiences across web and mobile.

Civils.ai is a no-code AI tool for construction projects that automates tendering, desk studies, and compliance checks. The platform helps civil engineers minimize construction risks and uncertainty through AI-powered data extraction and project analysis.

Enterprise LLM platform-build, fine-tune, and deploy language models for business use cases.

AI document generation platform for life sciences that automates regulatory paperwork for diagnostic, medical device, and drug development companies. Founded by Surbhi Sarna and Nate Smith.

Common Knowledge is a research lab and product company reimagining the document in the age of AI, building document-native interfaces and workflows for intelligence-rich, collaborative knowledge work.

Continua develops a Social AI agent that integrates into group chats on SMS, iMessage, and Discord to enhance collaboration and productivity. Founded by former Google Distinguished Engineer David Petrou, the AI assistant can automatically set reminders, launch polls, and add calendar invitations during group conversations.

Day.ai builds an AI-native CRM that turns customer conversations, meetings, and activity into structured context, helping go-to-market teams ask questions, surface risk, and automate follow-ups.

AI-powered legal search and due diligence platform that enables law firms and legal teams to instantly search, analyze, and surface insights across large document repositories.

Language data infrastructure platform transforming unstructured conversational data from chats, calls, surveys, and social media into actionable insights for enterprise digital transformation.

Document Crunch offers AI-powered contract risk review and compliance analysis software for construction teams and project stakeholders.

AI-powered compliance training platform for frontline workers that automatically identifies risks, generates documentation, and delivers bite-sized training content in over 25 languages.

Customer insights and research platform that centralizes and analyzes feedback from calls, surveys, tickets, and reviews using AI to identify themes and patterns for product teams.

Contract drafting, review, and negotiation AI powered by legal knowledge and precedent, delivering an AI Associate that executes complex legal workflows within Word with 95% acceptance rate.

Edia is an AI-powered unified data platform designed to boost learning outcomes in K-12 mathematics education by enabling teachers to differentiate instruction and deliver personalized help 10x faster, backed by a guarantee of improved state exam results.

EliseAI is an AI automation platform for the housing and healthcare industries, building AI workflows that automate the entire consumer journey from leasing to resident management. Valued at $2.2B after a $250M Series E led by a16z, EliseAI serves 28 of the top 30 property owners in the US.

AI-powered drug discovery platform advancing nature-inspired therapeutics from plants and natural products into clinical development.

Ethos is an AI-powered expert-matching platform that scours hundreds of millions of profiles to identify niche experts by analyzing their academic work, code, portfolios, and podcasts. Used by over 25 global investment firms and consultancies, the platform enables paid consulting calls on-platform, connecting private equity firms, hedge funds, and consulting companies with domain experts in minutes.

Embeddings-based search infrastructure providing a meaning-aware search API for AI applications. Exa trains embedding models to convert web pages into vector representations, enabling semantic search that understands intent rather than just matching keywords.

Fastino builds task-specific language models and small-model infrastructure for production AI workloads, focused on speed, accuracy, and agentic AI use cases.

Fathom is an AI meeting assistant that records, transcribes, and summarizes meetings, with workflow automations for CRM and team collaboration.

AI meeting assistant that records, transcribes, and summarizes meetings into searchable notes.

Firsthand builds an AI-powered Brand Agent platform that enables marketers and publishers to engage consumers through personalized, real-time AI interactions using proprietary content.

Fish Audio develops multilingual AI voice generation and voice cloning infrastructure for creators and developers, with text-to-speech APIs and audio production tools.

Building Yuma, a camera-based chat app that turns physical objects into conversational interfaces with foundational networking infrastructure.

Freed is an AI clinical assistant that eliminates medical documentation burden by automatically generating accurate medical notes from patient encounters. The platform helps clinicians reduce time spent on paperwork and administrative tasks, allowing them to focus more on patient care while maintaining comprehensive documentation.

AI-powered patent intelligence platform that helps lawyers and companies automate invention harvesting, generate novel patents, and analyze prior art. Built by ML researchers from Harvard and Stanford.

Research assistant that blends search, summarization, and AI agents to deliver curated answers with citations.

Gradium is a Paris-based AI company building ultra-low latency voice foundation models that enable near-instant, expressive, and multilingual voice AI at scale. Spun out of French AI lab Kyutai, the company was founded by former Google DeepMind researchers who pioneered key advances in audio language modeling. Backed by a $70 million seed round from FirstMark Capital, Eurazeo, Eric Schmidt, and Xavier Niel, Gradium aims to make voice the universal interface for AI.

AI-powered meeting recording and notetaking platform that automatically generates meeting summaries, transcripts, and actionable insights for remote and hybrid teams.

Grammarly is an AI-powered communication assistant that provides writing, grammar checking, tone detection, and style suggestions across platforms. It serves over 30 million daily active users and 70,000 enterprise teams worldwide.

Guru is an AI source-of-truth platform for knowledge work that connects company knowledge, delivers verified answers in workflow tools, and keeps information accurate automatically.

H Company is a frontier AI company building autonomous agents and foundation-model systems for enterprise work. The company develops research, model, inference, and infrastructure capabilities behind products like Runner H.

AI care partner platform for clinicians that automates clinical documentation, streamlines workflows, and improves patient care. Used across Australia, the US, UK, and Canada with partnerships including the NHS.

Hugging Face is the leading open-source AI platform for building, training, and deploying machine learning models. It hosts hundreds of thousands of models and datasets, serving as the central hub for the AI developer community.

Hyro provides a responsible AI agents platform for healthcare to automate patient communications across voice and digital channels.

Inflection AI develops personal AI assistant products and foundation-model capabilities for natural language interaction and conversational intelligence.

Inkeep provides a platform for customer-facing AI agents and automations, combining no-code builders with developer SDKs for support, product, GTM, and operations teams.

Instill AI is a persistent AI workspace that transforms complex documents into actionable insights. Users can upload unstructured data such as financial reports, legal contracts, and research papers, ask questions across entire projects, and receive answers traced to specific sources with no coding required.

Interhuman AI builds the social intelligence layer for AI systems, enabling them to read, interpret, and respond to human behavior in real time. Their technology combines body language, facial expression, and tone-of-voice analysis with contextual awareness to create more natural human-AI interactions.

AI contract review platform that automates analysis, redlining, and negotiation workflows for legal teams.

Building revolutionary agentic AI audio computers without screens, spun out of Alphabet X. The flagship iyo One is a wearable ear-computer enabling interaction with apps entirely through voice.

Enterprise AI marketing platform that helps teams generate on-brand content and campaign assets at scale, with workflows and AI copilots for marketing operations.

Juicebox is an AI-powered recruiting platform that uses LLM-powered search to automate talent sourcing and recruiting workflows, trusted by over 3,000 customers including Ramp, Perplexity, and leading AI labs, with access to 800 million candidate profiles globally.

Julius is an AI-powered data analysis platform that acts as a personal data scientist, enabling users to analyze and visualize datasets and perform predictive modeling through natural language prompts. With over 2 million users generating more than 10 million visualizations, Julius makes data science accessible to everyone.

Kore.ai develops enterprise conversational and agentic AI software for customer service, employee support, and workflow automation across regulated industries.

Langfuse is an open source LLM engineering platform providing observability, prompt management, evaluations, and datasets for AI application development. Acquired by ClickHouse in January 2026, the platform integrates with OpenTelemetry, LangChain, OpenAI SDK, and other major frameworks.

Lavender is an AI-powered email coaching platform that helps sales teams write more effective emails, using data from billions of emails to improve reply rates and drive revenue.

LawLoop is an AI-native agent platform for law firms that automates administrative work including client intake, document preparation, case management, scheduling, and billing. The platform features Gate for intake automation with 24/7 receptionist services, Chorus for client communications, and Loop for practice management dashboard.

Lightfield is an AI-native CRM that automatically captures and understands customer interactions, eliminating manual data entry and note-taking for sales teams. Built by the founders of Tome (the presentation tool with 25 million users), Lightfield provides complete customer memory that updates after every meeting and conversation. The platform enables founders and salespeople to focus on closing deals rather than secretarial work.

Lightpage is an AI-powered personal notebook that combines free-form notes, daily journaling, and a personal guide. It curates art, quotes, and articles based on your reflections and generates weekly summary letters.

LMArena develops and operates large-model evaluation infrastructure, including comparative benchmarks and community-driven testing workflows for frontier LLMs.

Lunos AI is an accounts receivable automation platform that deploys AI agents to manage receivables like a human colleague, reading customer histories, adapting tone and timing, handling two-way conversations, and working around the clock. The platform integrates with tools like QuickBooks and NetSuite, addressing the challenge of 57% of invoices being paid late across B2B finance.

Mail0 (also known as Zero) is an open-source, AI-native email client that uses artificial intelligence to prioritize emails, summarize threads, draft replies, and organize inboxes into smart categories. A Y Combinator X25 batch company, it focuses on privacy-first email management that helps knowledge workers save time on email triage.

Manifest is an AI-powered learning and support platform built for small business entrepreneurs. It combines enterprise-grade AI with industry expertise and learning science to deliver personalized, conversational guidance to SMB owners.

AI model routing and interpretability platform using breakthrough Model Mapping technology to unpack LLMs into interpretable architectures. Intelligently directs prompts to best-suited models.

AI video research lab and creator platform building full-stack foundation models for short-form video creation, editing, and marketing. Formerly known as Captions, Mirage powers over 200 million videos with AI-driven tools used by 20 million creators and businesses worldwide.

Miso is a personal agentic travel AI that enables high-frequency travelers to curate, book, change, and cancel flights, hotels, rental cars, and experiences through simple text messages. The platform maintains contextual awareness of previous bookings, preferences, and requirements to deliver a personalized travel management experience. Miso searches both cash and award inventory to optimize the cheapest mix for every booking.

Nous Research is an open-source AI lab developing large language models and decentralized training infrastructure, including Hermes models and the Psyche network.

Nowadays is the first AI-native platform for corporate event planning, automating everything from venue sourcing to vendor negotiations. Built by MIT engineers, it leverages a database of 400,000 global venues and AI agents that contact venues by email and phone to manage end-to-end event logistics.

Omi builds a wearable and app-based AI memory assistant for capture, transcription, search, and automated follow-up tasks.

Onyx is an open-source AI platform that connects to your company's docs, apps, and people, enabling enterprise search and AI-assisted knowledge retrieval across 40+ internal data sources. Used by hundreds of thousands of users including Netflix and Ramp, backed by Khosla Ventures and First Round Capital.

AI-powered medical information platform that synthesizes peer-reviewed clinical literature for physicians, functioning as an always-on clinical decision support tool used by hundreds of thousands of doctors.

Outverse builds AI support infrastructure for software companies, combining community, ticket, and product-context signals to automate repetitive support work and help teams resolve issues faster.

Pace is an AI-native business process outsourcer (BPO) for the world's leading insurers, combining agentic AI for document processing, web automation, and phone calls with human review to automate mission-critical insurance operations. The platform handles submission intake, FNOL, policy servicing, claims handling, and data entry tasks that traditionally relied on offshore labor. Backed by Sequoia Capital, Pace counts Prudential, The Mutual Group, and Newfront among its customers.

Parahelp provides an AI support agent platform built for fast-moving software companies, automating complex support tickets and handling refund requests like a teammate, serving leading companies like Perplexity, Framer, Replit, and HeyGen.

Parloa builds an enterprise AI agent platform for customer service teams to design, test, and scale voice and chat agents across millions of customer conversations.

Particle is an AI-based news reader that summarizes stories, tracks developing coverage, and gives users conversational news exploration tools.

Perplexity builds an AI-native answer engine and assistant that combines web retrieval with LLMs for consumer and enterprise search workflows.

Pinecone is a fully managed vector database that makes it easy to add vector search to production applications, powering AI applications with fast and scalable similarity search at any scale.

AI-powered IP protection platform that automates monitoring, takedown, and retroactive compensation for brand infringement across 7,800+ platforms. Cuts enforcement time by up to 90%.

poetiq is an AI research and engineering company building reasoning systems and self-improving intelligence infrastructure, founded by former Google DeepMind researchers.

Enterprise-grade AI voice assistants handling complex customer interactions across hospitality, healthcare, and financial services, spun out of Cambridge University.

Unified AI platform for financial institutions enabling banks and credit unions to offer banking services through AI-powered chats and voice conversations

API-first Document AI that converts PDFs, images, slides, and spreadsheets into structured JSON for RAG, analytics, and automation.

Pylon is the modern B2B customer support platform that helps companies manage support across Slack Connect, Microsoft Teams, email, in-app chat, and more. Used by over 750 fast-growing companies including Together AI, Cognition, and Temporal, Pylon unifies ticketing, AI support bots, and knowledge base into one platform.

Question-and-answer platform that connects people to share knowledge across millions of topics, featuring AI-powered Poe chatbot platform

Universal API for real-time meeting data, providing developers with recordings, transcripts, and metadata from Zoom, Google Meet, Microsoft Teams, and other video conferencing platforms. Powers over 300 enterprise clients including Instacart and Sybill.

Reducto provides a high-quality AI document ingestion and parsing API for large language models. The Y Combinator-backed company processes nearly a billion pages monthly for leading AI teams like Harvey and Scale AI.

Reflection AI is building frontier open intelligence accessible to all, developing open-weight AI models. Founded by former Google DeepMind researchers who co-created AlphaGo, raised $2B at an $8B valuation.

Reka builds multimodal foundation models and enterprise AI systems that combine text, image, audio, and reasoning capabilities for production applications.

AI-powered site builder and component library with 1,000+ components for Figma, Webflow, and React. Generates website sitemaps and wireframes from text prompts for dramatically faster site building.

AI voice platform enabling businesses to build and deploy AI-powered voice agents for phone operations, contact centers, and customer service. API-driven solution with natural, low-latency conversations and multilingual support.

Riverside is an online recording and editing studio for podcasts and video content, delivering studio-quality audio and video through local recording technology. Powered by AI-driven editing features including automatic transcription, clip generation, and magic enhancement.

Safe Superintelligence is an AI research company founded by Ilya Sutskever to pursue a singular mission of building safe superintelligence.

Screenpipe is an open source desktop AI memory platform that continuously captures screen and audio data for local search and automation.

Series is the first AI-powered social network, founded by Yale students, that uses AI agents called AI Friends to facilitate meaningful professional connections based on mutual value. Operating within iMessage, the platform has attracted 250,000 profiles, primarily Gen Z college students.

Siena builds autonomous customer experience agents for commerce brands, combining conversational AI, workflow automation, and analytics to resolve support issues while preserving brand voice.

Sitch is an AI-powered dating and matchmaking platform that combines concierge-style setup workflows with voice and messaging experiences to help users find intentional relationships.

Slite builds an AI-powered knowledge base for teams to document, search, and share company knowledge with collaborative docs and workflows.

Spellbook builds an AI copilot for transactional lawyers, helping legal teams review, draft, and negotiate contracts directly inside their document workflows.

Subtle Computing builds Voicebuds, AI-powered earbuds that isolate a chosen speaker in noisy environments to make in-person conversations clearer and more accessible.

AI-powered contract lifecycle management platform embedding workflows into Teams, Slack and Word, serving enterprise customers including NBA, MLB and NFL teams with five consecutive years of 100%+ ARR growth

Suno is an AI music generation platform that enables anyone to create original songs from text prompts. Based in Cambridge, MA, it has reached $200M in annual revenue and is one of the fastest-growing generative AI startups.

AI-native agentic data platform that integrates with SaaS tools and data warehouses, cleanses and normalizes data, and enables self-serve insights through natural language.

Sybill is an AI-powered GTM workflow assistant that analyzes meeting conversations to automatically generate summaries, deal notes, and CRM updates for sales teams.

Tako builds an AI data analyst that embeds into applications and returns cited answers with shareable visualizations across external and internal data sources.

Tandem Health builds AI medical scribe software that automates clinical documentation for healthcare providers.

Tavus is the human computing company building emotionally intelligent AI humans (PALs - Personal Affective Links) that communicate through text, voice, and face-to-face video with agentic capabilities and real-time perception. Powered by proprietary models including Phoenix-4, Sparrow-1, and Raven-1, Tavus enables AI agents that can see, hear, understand emotions, and act autonomously. Over 100,000 developers and enterprises use Tavus technology for recruiting, sales, education, and customer service.

Tofu is an AI-powered B2B marketing platform that enables GTM teams to create personalized omnichannel content and campaigns at scale.

Tolans (Portola) is developing an AI-powered conversational companion in the form of playful alien characters designed to enhance creativity, imagination, and emotional connection, offering every person on Earth a personalized embodied AI best friend.

Trace builds voice AI infrastructure for financial-service customer interactions, focusing on call automation and support workflow execution.

AI-powered transcription service using OpenAI Whisper technology to convert audio and video into searchable, editable transcripts with 99.8% accuracy across 98+ languages, offering automated summaries and exports.

Neuromorphic computing startup building brain-inspired analog hardware to achieve biology-scale energy efficiency for AI workloads, founded by former Databricks AI head Naveen Rao.

Uniphore provides an enterprise AI platform for customer engagement and operations, combining conversational AI, automation, and analytics in its Business AI Cloud.

Vapi is building the leading developer platform for conversational voice AI agents, abstracting away the complexity of building these agents and managing real-time infrastructure to enable enterprise-ready voice AI solutions across finance, healthcare, travel, and other industries.

Vectara provides a retrieval-augmented generation platform with enterprise search, grounded generation, and evaluation tooling to help teams build production-grade generative AI assistants.

voize builds a voice AI assistant for nursing documentation, helping care teams capture notes hands-free and in real time.

Volve is an AI-driven construction management platform that automates document processing and workflow automation. The platform reads, structures, and links context across RFPs, specifications, addenda, offers, and contracts, enabling faster decision-making and intelligent insights for construction industry professionals.

Vulcan Technologies uses AI to map every law, regulation, and court case in America, enabling government agencies and businesses to replace massive consulting projects with instant automated analyses.

AI-powered voice dictation software for seamless text creation enabling natural speech-to-text conversion with high accuracy

Wordsmith builds legal AI software that helps in-house legal teams review contracts, draft documents, and automate legal workflows with LLM-powered tools.

Wordware is a web-hosted IDE for building AI agents, enabling non-technical domain experts and engineers to collaboratively create, iterate, and deploy task-specific AI applications 20x faster. Backed by Spark Capital, Felicis, and Y Combinator, the platform offers prebuilt tools, API deployment, and tracing.

You.com builds AI search and retrieval infrastructure for teams that need domain-specific, production-ready search inside their own products and workflows.

AI-powered self-service business intelligence platform featuring a natural language AI data analyst that connects to cloud data warehouses like Snowflake, BigQuery, and Databricks.

ZeroEntropy provides a high-accuracy search API over unstructured data for AI agents and RAG applications. The YC-backed company builds smarter retrieval models enabling AI agents across healthcare, law, and sales.